add some const references in determinisation algo

alib2algo/src/automaton/determinize/DeterminizeRHDPDAPart.cxx

@@ -65,7 +65,7 @@ void ret(const DefaultStateType& state, const DefaultSymbolType& pdaSymbol, cons
 		const DefaultStateType& q = std::get<0>(transition.first);
 		for(const auto& to : transition.second) {
-			const DefaultStateType q1 = to.first;
+			const DefaultStateType& q1 = to.first;
 			const DefaultSymbolType& gamma = to.second;
 			for(const auto& entry : S) {
@@ -159,14 +159,14 @@ void local(const DefaultStateType& state, const std::variant<DefaultEpsilonType,
 	std::set<std::pair<DefaultStateType, DefaultStateType>> S1;
 	for(const auto& entry : S) {
-		DefaultStateType q = entry.first;
-		DefaultStateType q2 = entry.second;
+		const DefaultStateType & q = entry.first;
+		const DefaultStateType & q2 = entry.second;
 		for(const auto& transition : nondeterministic.getLocalTransitions()) {
 			if(q2 != transition.first.first) continue;
 			if(input != transition.first.second) continue;
 			for(const auto& to : transition.second) {
-				DefaultStateType q1 = to;
+				const DefaultStateType & q1 = to;
 				S1.insert(std::make_pair(q, q1));
 			}

alib2algo/src/automaton/determinize/DeterminizeVPAPart.cxx

@@ -57,7 +57,7 @@ void ret(const DefaultStateType& state, const DefaultSymbolType& pdaSymbol, cons
 		const DefaultStateType& q = std::get<0>(transition.first);
 		for(const auto& to : transition.second) {
-			const DefaultStateType q1 = to.first;
+			const DefaultStateType& q1 = to.first;
 			const DefaultSymbolType& gamma = to.second;
 			for(const auto& entry : S) {
@@ -137,14 +137,14 @@ void local(const DefaultStateType& state, const DefaultSymbolType& input, const
 	std::set<std::pair<DefaultStateType, DefaultStateType>> S1;
 	for(const auto& entry : S) {
-		DefaultStateType q = entry.first;
-		DefaultStateType q2 = entry.second;
+		const DefaultStateType & q = entry.first;
+		const DefaultStateType & q2 = entry.second;
 		for(const auto& transition : nondeterministic.getLocalTransitions()) {
 			if(q2 != transition.first.first) continue;
 			if(input != transition.first.second) continue;
 			for(const auto& to : transition.second) {
-				DefaultStateType q1 = to;
+				const DefaultStateType & q1 = to;
 				S1.insert(std::make_pair(q, q1));
 			}